Oil spec query - Alfa Romeo Forum
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Oil spec query

I have some Shell Helix Ultra Diesel 5W-30 oil, ACEA C4.
Is this likely to do any damage if I use it in my 2.4 JTDm engine?
I know I should use 5W-40 and ACEA B4, but is ACEA C4 better than B4? And what would be wrong with using 5W-30 instead of 5W-40?
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Use the right spec oil

Which is 5W40 spec.

5W30 is too thin.
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